Wuhan, located on the east of the Jianghan Plain and at the junction where the Han River joins the Yangtze River, has a humid subtropical mon-soon climate. There are abundant rainfall and sunshine as well as four distinct seasons. The climate of Wuhan changes a lot within a year. Summer begins from the second decade of May. Midsummer starts in July. The maximum tem-perature during this time mostly stays at 37-39 C; yet the minimum is still high, generally at 29-39 C. With high humidity at the same time, it is uncomfortably sultry. Autumn starts after October, with temperature gradually declining and the air becoming dry. The average temperature is 20-25 C, but sometimes it may reach 30 C or above. It is quick to get into winter from autumn as long as there is cold air coming from the north, leading to rapid fall of temperature. Winter begins at the end of December and runs through next February, with temperature averaging 1-3 C. When there is fine weather, temperature can be as high as 7-8 C; but when there is cold wave or sleet, temperature is usually below the freezing point. Spring is back after March with rapid rise of tem-perature, even to a maximum above 20 C. Yet, there might be an unusually cold spell in March and April, with temperature falling 15-20 C overnight and snow drifting about.

Pressure

monthly mean atmospheric pressure

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Pressure(hPa)

10243

10217

10175

10117

10076

10028

10008

10029

10104

10172

10219

10246

Pressure (hPa)

10243

10217

10175

10117

10076

10028

10008

10029

10104

10172

10219

10246

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.1 monthly mean pressure

Temperature

monthly mean temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Temp(oF)

38.6

42.4

50.1

62.2

71.4

78.2

83.6

82.9

74.1

63.8

52.5

42.8

Temp(oC)

3.7

5.8

10.1

16.8

21.9

25.7

28.7

28.3

23.4

17.7

11.4

6

Temperature (oC|oF)

3.7 oC 38.6 oF

5.8 oC 42.4 oF

10.1 oC 50.1 oF

16.8 oC 62.2 oF

21.9 oC 71.4 oF

25.7 oC 78.2 oF

28.7 oC 83.6 oF

28.3 oC 82.9 oF

23.4 oC 74.1 oF

17.7 oC 63.8 oF

11.4 oC 52.5 oF

6 oC 42.8 oF

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.2 monthly mean temperature

monthly extreme mean temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Min Temp(oF)

32.7

36.3

43.8

55.2

64.7

72.1

77.7

76.8

67.8

57

45.6

36.1

Min Temp (oC)

.4

2.4

6.6

12.9

18.2

22.3

25.4

24.9

19.9

13.9

7.6

2.3

Max Temp (oF)

46.4

50.1

57.9

70.5

79.5

85.4

90.6

90.5

82.2

72.8

61.7

51.4

Max Temp(oC)

8

10.1

14.4

21.4

26.4

29.7

32.6

32.5

27.9

22.7

16.5

10.8

monthly extreme daily temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Min Temp(oF)

-.6

11.8

25.8

33.2

46.5

55.4

64

63.5

50.3

34.3

19.2

13.8

Min Temp (oC)

-18.1

-11.2

-3.4

.7

8.1

13

17.8

17.5

10.2

1.3

-7.1

-10.1

Max Temp (oF)

75.5

80.4

82.7

92.3

96.9

99.3

102.7

101.8

99.6

93

85.6

72.5

Max Temp (oC)

24.2

26.9

28.2

33.5

36.1

37.4

39.3

38.8

37.6

33.9

29.8

22.5

Humidity

monthly mean hunidity

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Hunidity (%)

77

76

78

78

77

80

79

79

78

78

76

74

Hunidity (%)

77

76

78

78

77

80

79

79

78

78

76

74

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.3 monthly mean hunidity

monthly minimum daily hunidity

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Hunidity(%)

6

13

13

16

16

26

35

29

15

11

10

11

Precipitation

monthly mean precipitation

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Precipitation(mm)

43.4

58.7

95

131.1

164.2

225

190.3

111.7

79.7

92

51.8

26

Days (Precipitation<0.1mm)

9.1

9.5

13.5

13

13.2

13.3

11.2

9

9

9.3

8

6.6

Days (Precipitation<10mm)

1.4

1.8

3.7

4

4.3

5.2

4.3

2.8

2.3

2.6

1.6

.8

Days (Precipitation<25mm)

.2

.3

.6

1.5

2

3

2.4

1.5

.9

1

.4

0

Days (Precipitation<50mm)

0

0

0

.4

.6

1.3

1.1

.6

.3

.4

0

0

Precipitation (mm)

43.4

58.7

95

131.1

164.2

225

190.3

111.7

79.7

92

51.8

26

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.4 monthly mean precipitation

monthly maximum daily precipitation

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Precipitation(mm)

34.7

51.4

101

110.1

115.3

298.5

285.7

124.2

111.9

91.7

48.1

24

Wind

monthly mean wind speed

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Wind Speed(m/s)

1.8

1.9

2.1

2

1.9

1.9

2.1

1.9

1.8

1.7

1.7

1.7

Wind Speed (m/s)

1.8

1.9

2.1

2

1.9

1.9

2.1

1.9

1.8

1.7

1.7

1.7

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.5 monthly mean wind speed

monthly maximum daily
wind speed and direction

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Wind Speed (m/s)

10

9.7

11

15

13

11

15.3

14.7

11.3

10.7

10.3

14

Sunshine

monthly mean sunshine duration

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Duration (hour)

106.5

102.8

115.5

151.2

181.4

179.5

232.1

241

176.7

161.2

144.3

136.5

Duration (hour)

106.5

102.8

115.5

151.2

181.4

179.5

232.1

241

176.7

161.2

144.3

136.5

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.5 monthly mean sunshine duration

monthly sunshine percentage

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Percentage (%)

33

33

31

39

43

43

54

59

48

46

45

43

Remarks:
Weather forecast is provided by China Meteorological Administration.
Climate information is based on monthly averages for 30-year period of 1971-2000.
Precipitation includes both rain and snow.